천병구
2017-11-28T04:59:15Z
2017-11-28T04:59:15Z
2016-02
PHYSICAL REVIEW D, v. 93, NO 3, Article number 032003, Page. 32003-32003
2470-0010
2470-0029
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.93.032003
http://hdl.handle.net/20.500.11754/31907
We report a measurement of the differential cross section of pi(0) pair production in single-tag two-photon collisions, gamma*gamma -˃ pi(0) pi(0), in e(+) e(-) scattering. The cross section is measured for Q(2) up to 30 GeV2, where Q(2) is the negative of the invariant mass squared of the tagged photon, in the kinematic range 0.5 GeV ˂ W ˂ 2.1 GeV and vertical bar cos theta*vertical bar ˂ 1.0 for the total energy and pion scattering angle, respectively, in the gamma*gamma center-of-mass system. The results are based on a data sample of 759 fb(-1) collected with the Belle detector at the KEKB asymmetric-energy e(+) e(-) collider. The transition form factor of the f(0)(980) and that of the f(2)(1270) with the helicity-0, -1, and -2 components separately are measured for the first time and are compared with theoretical calculations.
Special thanks are due to V. G. Serbo for various useful discussions and for kindly providing the cross section formula that includes the phi* dependence for single-tag two-photon production of pi0 pi0, without which we could not perform this analysis. We thank the KEKB group for the excellent operation of the accelerator; the KEK cryogenics group for the efficient operation of the solenoid; and the KEK computer group, the National Institute of Informatics, and the PNNL/EMSL computing group for valuable computing and SINET4 network support. We acknowledge support from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan, the Japan Society for the Promotion of Science (JSPS), and the Tau-Lepton Physics Research Center of Nagoya University; the Australian Research Council and the Australian Department of Industry, Innovation, Science and Research; Austrian Science Fund under Grants No. P 22742-N16 and No. P 26794-N20; the National Natural Science Foundation of China under Contracts No. 10575109, No. 10775142, No. 10875115, No. 11175187, and No. 11475187; the Chinese Academy of Science Center for Excellence in Particle Physics; the Ministry of Education, Youth and Sports of the Czech Republic under Contract No. LG14034; the Carl Zeiss Foundation, the Deutsche Forschungsgemeinschaft and the VolkswagenStiftung; the Department of Science and Technology of India; the Istituto Nazionale di Fisica Nucleare of Italy; National Research Foundation (NRF) of Korea Grants No. 2011-0029457, No. 2012-0008143, No. 2012R1A1A2008330, No. 2013R1A1A3007772, No. 2014R1A2A2A01005286, No. 2014R1A2A2A01002734, No. 2014R1A1A2006456; the Basic Research Lab program under NRF Grants No. KRF-2011-0020333, No. KRF2011-0021196, Center for Korean J-PARC Users, No. NRF-2013K1A3A7A06056592; the Brain Korea 21-Plus program and the Global Science Experimental Data Hub Center of the Korea Institute of Science and Technology Information; the Polish Ministry of Science and Higher Education and the National Science Center; the Ministry of Education and Science of the Russian Federation and the Russian Foundation for Basic Research; the Slovenian Research Agency; the Basque Foundation for Science (IKERBASQUE) and the Euskal Herriko Unibertsitatea (UPV/EHU) under Program No. UFI 11/55 (Spain); the Swiss National Science Foundation; the National Science Council and the Ministry of Education of Taiwan; and the U.S. Department of Energy and the National Science Foundation. This work is supported by a Grant-in-Aid from MEXT for Science Research in a Priority Area ("New Development of Flavor Physics") and from JSPS for Creative Scientific Research ("Evolution of Tau-lepton Physics").
en
AMER PHYSICAL SOC
TRANSITION FORM-FACTORS
RADIATIVE-CORRECTIONS
PHOTON
E(+)E(-)
MESONS
BELLE
Study of pi(0) pair production in single-tag two-photon collisions
Article
3
93
10.1103/PhysRevD.93.032003
32003-32003
PHYSICAL REVIEW D
Masuda, M.
Uehara, S.
Watanabe, Y.
Nakazawa, H.
Abdesselam, A.
Adachi, I.
Aihara, H.
Al Said, S.
Asner, D. M.
Cheon, B. G.
2016002893
S
COLLEGE OF NATURAL SCIENCES[S]
DEPARTMENT OF PHYSICS
bgcheon